String Swap

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In this problem, you are given a string of N characters(1-indexed), and an integer D. You perform multiple operations on this string. In the first operation you select the first D characters of the string, ie. the substring S[1...D] and reverse it. The other characters remain unchanged. Thus, after the first operation the string changes as shown: S1S2S3...SD-1SDSD+1...SN-1SN => SDSD-1....S3S2S1SD

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solution.cppC++17

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